ISSN: 2277-9655 [Sukanthi * et al., 7(1): January, 2018] Impact Factor: 5.164 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com © International Journal of Engineering Sciences & Research Technology [508] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY SEASONAL DYNAMICS OF PRODUCTIVITY OF SULUR LAKE OF COIMBATORE DISTRICT, TAMIL NADU, INDIA IN RELATION TO TOTAL DISSOLVED SOLIDS, CHLORIDE AND MAGNESIUM Sukanthi M.K. *1 and J. Ebanasar 2 *1&2 Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam, The Nilgris, Tamil Nadu, India DOI: 10.5281/zenodo.1158656 ABSTRACT The water quality parameters of Sulur Lake situated in Coimbatore District of Tamil Nadu (11 ° 01’ 40” N and 77 ° 07’20” E) have been studied from July 2015 to July 2016. The present paper dealt with the seasonal variation of productivity and its relation to Total Dissolved Solids (TDS), Chloride and Magnesium. In the present study, Total Dissolved Solids of the six stations varied from 490 mg/l to 950 mg/l, Chloride ranges between 249.92 mg/l and 445.88 mg/l and Magnesium varied from 20.9 mg/l to 65.2 mg/l during the study period. Gross Primary Productivity (GPP) ranged from 1.3601 gC/m3/hr to 3.1736 gC/m3/hr, Net Primary Productivity (NPP) varied between 0.7556 gC/m3/hr and 2.8713 gC/m3/hr and Community Respiration (CR) varied from 0.1511 gC/m3/hr to 0.9067 gC/m3/hr. The data on the physico-chemical characteristics of this aquatic wetland revealed that this water body needs immediate and broad water quality monitoring and to find the remedial measures to improve this important water body in the study area. The mathematic relationships of these factors were analyzed using CURVEXPERT software and the significant relationships are expressed and their significance in the prediction of water quality is discussed KEYWORDS: Sulur Lake, Productivity, Total Dissolved Solids, Chloride and Magnesium. I. INTRODUCTION Coimbatore, Indian Manchester is gifted with a unique spread of a number of wetland water bodies that store rain water, recharge ground water and provide shelter for a vast array of biodiversity. (Priyatharsini and Dhanalakshmi, 2016). Almost all the fresh water bodies are under great pressure from human population explosion and developmental activities in and around the wetland. Lake water has been used for agricultural and irrigation purposes and fish culturing by local farmers. These wetlands serve as a common reservoir of untreated industrial effluents, dumping of agricultural as well as municipal wastes bring more concern for the aquatic environment. (Manikandan et al., 2016).The quality of water in any ecosystem provides significant information about the available resources for supporting life in that ecosystem. (Medudhula Thirupathaiah et al., 2012). The health of lakes and their biological diversity are directly related to health of almost every component of the ecosystem. The lakes are also subjected to various natural processes taking place in the environment like the hydrologic cycle, with unprecedented developmental activities; human beings are responsible for choking several lakes to death. Storm water runoff and discharge of sewage into the lakes are a few of the common causes where various nutrients enter the aquatic ecosystems resulting in their death. (Pattusamy et al., 2013) Inappropriate management of water resources has resulted in their major shifts in the quantity and quality of water resources. Aquatic ecosystems have been recognized worldwide as extremely important and are sensitive to anthropogenic activities viz. urban, industrial and agricultural activities. (Abhijna, 2016). Earth is the only planet having about 70% of water. Due to increased human population, industrialization etc., it is highly polluted with different harmful contaminants. Therefore, it is necessary that the quality of drinking water should be checked at regular time interval, because due to the use of contaminated drinking water human population suffers from various water borne diseases. Water pollution is a serious problem in India as almost 70% of its surface water resources and a growing percentage of its groundwater reserves are contaminated by biological, toxic organic and inorganic pollutants. (Sagar et al., 2015). Polluted surface waters cannot achieve a balanced ecosystem. Industrialization and urbanisation exhibit major impact on surface water environment in Coimbatore District, Tamil Nadu, India. Due to the developmental activities, both surface and subsurface water sources are getting polluted. Numerous textiles, automobiles, home